New Technology for Raising the Production in Injecting Steam Well by Using SEPA

摘要

High cycle stimulation in Henan heavy oilfield has beenrnsuffering the problems such as low formation pressure, muchrnaccumulated water which deadly influence the steam thermalrnefficiency，leading to a bad production recovery. In highrntemperature, SEPA solution can decompose out gas that canrnincrease the elastic flooding energy, compounding withrnspecial surfactant and alkaline, SEPA can develop steamrnconformance and flooding efficiency. Laboratory tests showrnthat the recovery of non-homogeneity core has been increasedrnby 16.5 percent point. This technology has been used morernthan 120 wells in Henan oilfield and effective rate reachrn92.5percent. It has been proved that the injecting well has arnbigger peak daily output、longer valid period and a significantrnincrement of production.